[Talk-GB] OS VectorMap water feature import

[Tim François]

I've done the same as Craig: exported only the features I was interested in
using QGIS, before using JOSM to tidy it up.

I did Chew Valley Lake and the River Chew running into it from the Avon at
Keynsham.
http://www.openstreetmap.org/?lat=51.3356781005859&lon=-2.61131286621094&zoom=13

The entire process took a long, long time (we're talking many hours), as
the OS data is all fragmented and needs joining up.

(Thinking about it I think I also did the Avon from Keynsham, through Bath
and out the other side. I had a lot of spare time back then...)

Tim

On Sun, Dec 11, 2011 at 6:28 PM, Craig Loftus <
craigloftus+osm at googlemail.com> wrote:

> > Have any large scale imports from this dataset already been done?
>
> Unfortunately some have. Orkney is particularly bad.
>
> > Do people think this is a good idea?  Any suggestions regarding the
> process?
>
> I don't think area based importing is useful. Too many fragmented
> waterways, and non-existent drains get pulled in. The few imports I've
> done have focused on specific features, e.g., the banks and
> tributaries of a river in an area I was mapping. It takes a long time
> to get the sections connected together, the islands added, and all the
> waterways connected; without focusing on a specific feature it would
> be far too easy to overlook bits that needed tidying up.
>
> In terms of the process, I found it useful to select and export just
> the features I wanted in QGIS before extracting to OSM. And then to
> use the JOSM validator to quickly eliminate the hundreds of duplicate
> and unconnected nodes that seem to be created. Using exallpoly.py with
> riverbanks tends to result in problems and I ended up modifying it to
> not close the areas.
>
> Craig
>
> On 11 December 2011 11:26, Borbus <borbus at gmail.com> wrote:
> > First of all, when I say import I mean a manual import: reprojection of
> > OS shapefiles, conversion to OSM data and careful processing in JOSM
> > before uploading.
> >
> > I'd really like to get all the water features from OS into OSM.  It's
> > very useful data and also makes maps prettier.  It's quite a laborious
> > task, though, as the data requires manual creation of multipolygons and
> > of course merging with any water features we already have.
> >
> > I have already done a small amount here:
> > http://www.openstreetmap.org/?lat=52.6006&lon=1.6362&zoom=13&layers=M
> > Although I have not joined together all gaps, just some gaps where a way
> > crosses it and it is obviously a conduit.
> >
> > Now I have split the Vectormap square TG into smaller chunks which I
> > plan to process one by one and upload.  The amount of data in just this
> > square is quite large, but it's still probably less than half of Norfolk.
> >
> > Have any large scale imports from this dataset already been done?
> >
> > Do people think this is a good idea?  Any suggestions regarding the
> process?
> >
> > Happy mapping,
> >
> > Borbus.
> >
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